Actually, I think this is a really good commit message, period. Sure, you don't want to detail every change to this extent, but important architectural fixes are fine.

(That said, speculating about the future in a medium where you don't necessarily record "well, that didn't work" and cannot go back to add something may not be optimal.)

Yep. Especially "bug fixes" which don't actually fix bugs, and "improvements" which touch half the codebase for about 15 different reasons none of which is explained.